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74HC157
HCT157 QUAD 2 CHANNEL MULTIPLEXER HCT158 QUAD 2 CHANNEL MULTIPLEXER INV.
M54HCT157/158 4HCT157/158HCT158 QUAD2 CHANNEL MULTIPLEXER (INV.)
HCT157 QUAD2 CHANNEL MULTIPLEXER
B1R(Plastic Package)
ORDER CODES:M54HCTXXXF1R M74HCTXXXM1R
M74HCTXXXB1R M74HCTXXXC1R
F1R(CeramicPackage)
M1R(MicroPackage)
C1R(Chip Carrier)
PIN CONNECTIONS (top view)= Internal
HCT158
HCT157
DESCRIPTION HIGH SPEED
tPD=21ns (TYP.) AT VCC =5V. LOWPOWER DISSIPATION
ICC =4 μA (MAX.) ATTA =25 °C. COMPATIBLE WITH TTL OUTPUTS
VIH= 2V (MIN.) VIL= 0.8V (MAX). OUTPUT DRIVE CAPABILITY LSTTL LOADS. SYMMETRICAL OUTPUT IMPEDANCE
IOH =IOL=4 mA (MIN.). BALANCEDPROPAGATION DELAYS
tPLH =tPHL. PIN AND FUNCTION COMPATIBLE
WITH 54/74LS157/158
The M54/74HCT157 and the M54/74HCT158 are
high speed CMOS QUAD 2-CHANNEL MULTI-
PLEXERs fabricated with silicon gateC2 MOS tech-
nology. They achieve the high speed operation
similarto equivalent LSTTL while maintaining the
CMOS low power dissipation.
These devices consistof four 2-input digital multi-
plexers with common select and strobe inputs. The
HCT158is an inverting multiplexer while the
HCT157isa non-inverting multiplexer. When the
STROBE inputis held High, selectionof dataisin-
hibited and all the outputs become Lowin the
M74HCT157 and Highin theM74HCT158. The SE-
LECT decoding determines whether theAorB in-
puts get routedto their correspondingY outputs.All
inputs are equipped with protection circuits against
static discharge and transient excess voltage.
M54/74HCT devices are designedto directly inter-
face HSC2 MOS systems with TTL andNMOS com-
ponents. They are also plugin replacements for
CHIP CARRIER
HCT157 HCT158
PIN DESCRIPTION (for HCT157)
PIN No SYMBOL NAME AND FUNCTION SELECT Common Data Select
Input5, 11,14 1Ato4A Data Inputs From
SourceA6, 10,13 1Bto4B Data Inputs From
SourceB7,9,12 1Yto4Y Multiplexer Output STROBE Strobe Input GND Ground (0V) VCC Positive Supply Voltage
PIN DESCRIPTION (for HCT158)
PIN No SYMBOL NAME AND FUNCTION SELECT Common Data Select
Input5, 11,14 1Ato4A Data Inputs From
SourceA6, 10,13 1Bto4B Data Inputs From
SourceB7,9,12 1Yto4Y Multiplexer Output STROBE Strobe Input GND Ground (0V) VCC Positive Supply Voltage
INPUT AND OUTPUT EQUIVALENT CIRCUIT
M54/M74HCT157 M54/M74HCT158
TRUTH TABLE
INPUTS OUTPUTS
STROBE SELECT A B Y (HCT157) Y (HCT158) X X L H
LLL X L H H X H L X L L H X H HL DON’T CARE
IEC LOGIC SYMBOL
HCT157 HCT158
LOGIC DIAGRAM
HCT157 HCT158
M54/M74HCT157 M54/M74HCT158
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value UnitVCC Supply Voltage -0.5to+7 V DC Input Voltage -0.5to VCC+ 0.5 V DC Output Voltage -0.5to VCC+ 0.5 V
IIK DC Input Diode Current ±20 mA
IOK DC Output Diode Current ±20 mA DC Output Source Sink Current Per Output Pin ±25 mA
ICCor IGND DC VCCor Ground Current ±50 mA Power Dissipation 500(*) mW
Tstg Storage Temperature -65to +150 oC Lead Temperature (10 sec) 300 oC
Absolute MaximumRatings arethose values beyond whichdamage tothedevicemayoccur.Functional operation under theseconditionisnotimplied.
(*)500 mW:≅65oC derate to300mWby 10mW/oC:65o Cto85oC
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Value UnitVCC Supply Voltage 4.5to5.5 V Input Voltage 0to VCC V Output Voltage 0to VCC V
Top Operating Temperature:
M54HC Series
M74HC Series
-55to +125
-40to +85CC
tr,tf Input Rise and Fall Time (VCC= 4.5to 5.5V) 0to 500 ns
M54/M74HCT157 M54/M74HCT158
SPECIFICATIONSSymbol Parameter
Test Conditions Value
UnitVCC(V)
=25oC
54HC and 74HC
-40to85oC
74HC
-55to 125oC
54HC
Min. Typ. Max. Min. Max. Min. Max.VIH High Level Input
Voltage
2.0 2.0 2.0 V
VIL Low Level Input
Voltage
0.8 0.8 0.8 V
VOH High Level
Output Voltage 4.5=
VIH
VIL
IO=-20μA 4.4 4.5 4.4 4.4IO=-4.0 mA 4.18 4.31 4.13 4.10
VOL Low Level Output
Voltage 4.5=
VIH
VIL
IO=20μA 0.0 0.1 0.1 0.1
IO= 4.0 mA 0.17 0.26 0.33 0.4 Input Leakage
Current 5.5 VI =VCCor GND ±0.1 ±1 ±1 μA
ICC Quiescent Supply
Current
5.5 VI =VCCor GND 4 40 80 μA
ΔICC Additional worst
case supply
current
5.5 Per Input pin= 0.5Vor= 2.4V
Other Inputsat
VCCor GND
IO=0
2.0 2.9 3.0 mA
M54/M74HCT157 M54/M74HCT158
ELECTRICAL CHARACTERISTICS (CL =50 pF, Inputtr =tf =6 ns)
Symbol Parameter
Test Conditions Value
UnitVCC(V)
=25oC
54HC and 74HC
-40to85oC
74HC
-55to 125oC
54HC
Min. Typ. Max. Min. Max. Min. Max.tTLH
tTHL
Output Transition
Time
4.5 8 151922 ns
tPLH
tPHL
Propagation
Delay Time
(A,B-Y)
4.5 16 25 31 38 ns
tPLH
tPHL
Propagation
Delay Time
(SELECT-Y)
4.5 19 30 38 45 ns
tPLH
tPHL
Propagation
Delay Time
(STROBE-Y)
4.5 17 27 34 41 ns
CIN Input Capacitance 5 10 10 10 pF
CPD(*) Power Dissipation
Capacitance
HCT157 50 pF
HCT158 60 pF
(*) CPD isdefinedasthe valueofthe IC’sinternal equivalent capacitance which iscalculated fromthe operatingcurrent consumption without load.
(Referto Test Circuit).Average operting currentcanbe obtained bythefollowingequation. ICC(opr)=CPD •VCC •fIN+ICC/4(per channel)
SWITCHING CHARACTERISTICS TEST CIR-
CUIT
TEST CIRCUIT ICC (Opr.)
INPUTWAVEFORM ISTHE SAMEAS THATIN CASEOF
SWITCHINGCHARACTERISTICSTEST.
M54/M74HCT157 M54/M74HCT158
